JPS5944439B2 - Internally filled strong paper and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internally filled strong paper with special properties and a method for producing the same.

Traditionally, natural polymeric substances such as starch and its derivatives, or synthetic polymeric substances such as urea resin, melamine resin, polyvinyl acetate, polyacrylic ester, etc.
Paper quality has been improved by adding acrylamide polymers during the paper manufacturing process, but this has resulted in problems such as poor adhesion to paper fibers, a decrease in dry tear strength, and brittleness and brittleness during long-term storage. There were drawbacks such as hS.

In addition, if aqueous emulsions such as polyvinyl acetate or polyacrylic acid ester are used as they are, they have disadvantages such as a change in yield, adhesion to the walls of the pulp storage tank, abrasion of the wire mesh, and contamination of the blanket. During the drying process, the adhesion properties characteristic of synthetic resin emulsions were exhibited, resulting in problems such as adhesion to the dryer surface.

As a result of various studies aimed at solving these problems, the present inventors were able to complete the present invention by creating a strong paper with better performance than expected.

That is, the present invention is made of paper fibers A that form a paper plate, and a resin-like substance that fills and coats the interstitial space and the surface of the fibers. fiber C
An internally filled strong paper consisting of a synthetic resin emulsion agglomerated precipitate D containing: and its manufacturing method.

Therefore, there are at least three methods for producing it.

The first step is to make paper by adding short fibers C that cannot form a paper web and synthetic resin emulsion agglomerated precipitates D to a pulp slurry in a heater containing pulp A for forming a paper web, and to make paper by AlOO weight. This is a method for producing an internally filled strong paper, characterized in that C is 8 to 60 parts by weight and D is 5 to 150 parts by weight. Part 2 is a mixture of short fibers C and synthetic resin emulsion that can be used to form a paper web, and a mixture of short fibers C and synthetic resin emulsion flocculation precipitate D, which is obtained by agglomeration and co-precipitation of a mixture of short fibers C and synthetic resin emulsion. Pulp A for forming fish
C is added to the pulp slurry in a heater containing 8 to 60 C to the weight part of AlOO.
D is 5 to 150 parts by weight.

Part 3 is to add short fibers C, which cannot form a paper web, and a synthetic resin emulsion to a pulp slurry in a heater containing pulp A for paper web formation, and to make paper by coagulating them using a flocculant. This is a method 2 for producing an internally filled strong paper, characterized in that C is 8 to 60 parts by weight and the aggregated synthetic resin emulsion D is 5 to 150 parts by weight based on the weight part of AlOO.

The short fibers that cannot form a paper web used in the present invention are fine fibers among natural fibers such as paper pulp and artificial fibers such as nylon, and those that can pass through a wire mesh of 60 to 150 meshes are preferred. .

3/3) As long as the pulp is within this range, fine pulp that has passed through a wire mesh for paper making that is present in nozzle for flocking or papermaking wastewater can also be used satisfactorily.

Furthermore, the synthetic resin emulsion used in the present invention is α,
It is a polymer aqueous 3-mulsion of β-monoethylenic monomers, and examples of α,β-monoethylenic monomers include vinyl acetate, vinyl propionate, vinyl versatate (trade name: VeOva by Ciel Chemical), etc. vinyl esters, untetrasaturated acids such as acrylic acid, methacrylic acid, crotonic acid, and maleic acid and their alkyl esters, monovinylidene aromatics such as styrene, methylstyrene, and chlorostyrene, ethylene, propylene, and vinyl chloride. These polymer aqueous emulsions are obtained by homoemulsion polymerization or emulsion copolymerization of these monomers in an aqueous system to form an aqueous emulsion.

At this time, crosslinkable monomers such as N-mesarol acrylamide, n-butoxymethyl acrylamide, glycidyl methacrylate, diacetone acrylamide, allyl methacrylate, diethylene glycol dimethacrylate, acrylonitrile, atarylamide, dibutyl maleate, etc. Commonly used copolymerizable monomers may be copolymerized. The flocculants used in the present invention include Alba sulfate, ferric sulfate, ferric chloride, aluminum chloride,
b) Polyvalent metal salts such as aluminum chloride and polyacrylamide and polymer flocculants Tls are used.

A suitable flocculant is BS, which is a combination of the above-mentioned flocculant, a trace amount of a water-soluble boron compound such as boric acid or borax, and slaked lime or barium hydroxide. For example, when a water-soluble boron compound is first added to a synthetic resin emulsion, and then an appropriate amount of slaked lime or barium hydroxide and a polyvalent metal salt are sequentially added, the resin particles in the emulsion rapidly coagulate and settle. Of the three types of drugs mentioned above, secondary chloride is used as a polyvalent metal salt.
If iron is used to produce agglomerated precipitates to produce embedded strong paper, the resulting embedded strong paper will have an extremely large antistatic effect.

When these three types of chemicals are used in combination, it is preferable to add them in the following order: boron compound, slaked lime or barium hydroxide, and polyvalent metal salt.

The amount of boron compound added is 0.01 to 10% (based on the resin content).
% by weight, the same applies hereinafter), slaked lime or barium hydroxide O,
2 to 20(f) and 0.05 to 50% of polyvalent metal salt are suitable. Moreover, these drugs may be used alone or in combination for each group.

In the present invention, fine short fibers and synthetic resin emulsion are applied in an aggregated state during the papermaking process, so
The internally filled strong paper of the present invention and its manufacturing method have the following characteristics.

1 The short fibers in this state have a high affinity with the paper fibers in the pulp slurry, so they are adsorbed without waste, and the synthetic resin emulsion is coagulated, so it does not have any special adhesive properties, so it does not cause contamination of the blanket or sticking to the dryer surface. This does not occur and the clarity of the white water is extremely high.

2. Unlike when filled with calcium carbonate or clay, the resulting paper is flexible and strong.

This is a feature that cannot be obtained with clay. 3. Wear of wire mesh B3 is reduced.

4. Size effect appears on the resulting paper.

5 The resulting paper can be used for BS printing such as wood grain printing for decorative boards without undercoating.

6 The obtained paper contains a large amount of resin (50 to 200
), so cardboard etc. should be heat-sensitive molded.B
3 I can do it.

7 By selecting a flocculant, paper can be changed to have a greater antistatic effect, and can be used for special purposes such as interleaving paper for plate glass.B
I can do S.

Next, the present invention will be explained with reference to Examples.

Example 1 A polyvinyl acetate emulsion with a concentration of about 50% was diluted with water to a concentration of 1%, and 1% boric acid was added to the resin content,
Next, 10% slaked lime was added, and finally 5% aluminum chloride was added to coagulate the resin, and the supernatant was removed to obtain a coagulated resin slurry with a resin concentration of about 20%.

Separately, pulp whose main component is kraft pulp is
Beating to 5°SR, add 150% resin content of the above-mentioned agglomerated resin slurry to the raw material pulp in a heater, and then add nylon pile (fineness 3d1 length 0.5md) to 50% of the raw material pulp. The mixture was added after sufficiently moistened with water, stirred in a heater to mix uniformly, and then an internally filled strong paper was made using five vats.

There was no contamination of the blanket or adhesion to the dryer surface, and the white water had extremely high clarity. The resulting inner-filled strong paper is strong, has high interlaminar strength, can be formed by heating (t)3, and has a high sizing degree of B3, so it can be printed for decorative boards (wood grain patterns, etc.) without an undercoat. Ta.

Example 2 Instead of the agglomerated resin slurry used in Example 1, a concentration of about 400! ) The vinyl acetate/acrylic copolymer emulsion of ) was diluted with water to a concentration of approximately 2%, and 10% of the resin content was added with vanacium sulfate to coagulate the resin content, and the supernatant liquid was removed. Inner-filled strong paper was made in the same manner as in Example 1, except that an agglomerated resin slurry having a resin content of about 100 I) was used.

There was no contamination of the blanket or adhesion to the dryer surface, the transparency of the white water was extremely high, and the performance of the resulting inner-filled strong paper was equivalent to that of Example 1.

Example 3 Instead of the polyvinyl acetate emulsion diluted to a concentration of 1% used in Example 1, a solid content of 0.1
% (main components are single or copolymer emulsions of acrylic esters, styrene, and vinyl acetate, with other emulsifiers such as surfactants and water-soluble polymers mixed in B3). In addition, in place of the added nylon pile, papermaking sludge with a solid content of about 20% obtained from papermaking wastewater (mainly composed of short fiber pulp, natural or synthetic water-soluble resin, and other paper fillers) was used. Inner-filled strong paper 1 was produced in the same manner as in Example 1, except that the following materials were used:

The performance of the obtained inner-filled strong paper was also equivalent to that of Example 1. Example 4 The wastewater from the emulsion factory used in Example 3 and the papermaking sludge also used in Example 3 were mixed so that the solid content was 1:1 (weight ratio), and the resin content in the wastewater was mixed. 2% boric acid was added to the solution, and then . 15
By adding (:f) of slaked lime and finally adding 10 (fl) of ferric chloride, the resin and sludge are coagulated and co-precipitated, resulting in a short fiber-containing synthetic resin with a solid content concentration of about 20 (f). An emulsion flocculated precipitate was obtained.

An equal amount of solid content of this was added to the waste paper pulp in a heater, wet paper was made using a fourdrinier paper machine in a conventional manner, and the paper was heated and dried using an anchor dryer to produce an internally filled strong paper.
There was no contamination of the blanket or adhesion to the dryer surface, and the white water was extremely clear.

The resulting internally filled strong paper was strong, had a size effect of t)3, and had excellent printability.

Moreover, it had good electrostatic properties, so when it was sandwiched between sheets of glass, it was very easy to remove.
Example 5 The papermaking sludge used in Example 3 was added at a solid content of 10% based on the raw material pulp to a kraft pulp slurry of 20 single SR in a heater, and then vinyl acetate/ethylene copolymerization was performed at a concentration of 50%. After adding 5 (f) of emulsion to the raw material pulp as a resin content and mixing uniformly, 5 (f) of boric acid to the resin content was added, then 100 tons of slaked lime was added, and finally 5% of the emulsion was added to the raw material pulp. Ferric chloride was added to agglomerate the resin and sludge, which was then adsorbed onto kraft pulp. Paper was made using a fourdrinier paper machine, and then heated and dried to produce an internally filled strong paper.

The blanket did not get dirty or stuck to the dryer surface/)3, and the white water was extremely clear.

The resulting internally filled strong paper was strong, had a size effect of 3), and had excellent printability.

Also, because of its good electrostatic properties, it was very easy to peel off -C, which was used as an interleaving paper for plate glass. Comparative Example 1 An inner filler paper was made in the same manner as in Example 1 except that nylon pile was not added.

Comparative Example 2 Clay was used instead of nylon pile at a ratio of 5% to the raw material pulp.
Inserted paper was made in the same manner as in Example 1 except that 0% of the content was added.

Comparative Example 3 Paper-filling paper was made in the same manner as in Example 5 except that no papermaking sludge was added.

Test Examples In Examples 1 and 5 and Comparative Examples 1 to 3, the following comparative tests were conducted using eco-paper as samples.

The comparative test results are shown in the following table.

Claims (1)

[Scope of Claims] 1. It is formed by several paper fibers A and a resin-like substance that fills and covers the spaces between the fibers and the surface of the paper fibers, and the resin-like substance forms a paper web. It consists of a synthetic resin emulsion flocculated precipitate containing short fibers C, and A10
C is 8 to 60 parts by weight relative to 0 parts by weight, and D is 5 to 60 parts by weight.
An internally filled strong paper characterized by having a weight of 150 parts by weight. 2. Making paper by adding short fibers C that cannot form a paper web and synthetic resin emulsion agglomerated precipitate D to a pulp slurry in a beater containing pulp A for forming a paper web, and for 100 parts by weight of A. C is 8 to 60 parts by weight,
A method for producing an internally filled strong paper, characterized in that D is 5 to 150 parts by weight. 3. A mixed resin material of short fibers C and synthetic resin emulsion flocculation precipitate D, which is obtained by agglomerating and co-precipitating a mixture of short fibers C and synthetic resin emulsion that cannot form a paper web, is used to form a paper web. It is characterized in that it is added to a pulp slurry in a beater containing pulp A for paper making, and that C is 8 to 60 parts by weight and D is 5 to 150 parts by weight with respect to 100 parts by weight of A. Manufacturing method for internally filled strong paper. 4. Adding short fibers C that cannot form a paper web and a synthetic resin emulsion to a pulp slurry in a beater containing pulp A for forming a paper web, and aggregating them using an aggregating agent to make paper, and A100. C is 8 to 60 to parts by weight
The aggregated synthetic resin emulsion D is 5 parts by weight.
150 parts by weight.